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StgSharp.Native/sdl-src/thread/psp/SDL_sysmutex.c

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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_PSP
+
+// An implementation of mutexes using semaphores
+
+#include "SDL_systhread_c.h"
+
+#include <pspthreadman.h>
+#include <pspkerror.h>
+
+#define SCE_KERNEL_MUTEX_ATTR_RECURSIVE 0x0200U
+
+struct SDL_Mutex
+{
+    SceLwMutexWorkarea lock;
+};
+
+SDL_Mutex *SDL_CreateMutex(void)
+{
+    SDL_Mutex *mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
+    if (mutex) {
+        const SceInt32 res = sceKernelCreateLwMutex(
+            &mutex->lock,
+            "SDL mutex",
+            SCE_KERNEL_MUTEX_ATTR_RECURSIVE,
+            0,
+            NULL);
+
+        if (res < 0) {
+            SDL_free(mutex);
+            mutex = NULL;
+            SDL_SetError("Error trying to create mutex: %lx", res);
+        }
+    }
+    return mutex;
+}
+
+void SDL_DestroyMutex(SDL_Mutex *mutex)
+{
+    if (mutex) {
+        sceKernelDeleteLwMutex(&mutex->lock);
+        SDL_free(mutex);
+    }
+}
+
+void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS  // clang doesn't know about NULL mutexes
+{
+    if (mutex) {
+        const SceInt32 res = sceKernelLockLwMutex(&mutex->lock, 1, NULL);
+        SDL_assert(res == SCE_KERNEL_ERROR_OK);  // assume we're in a lot of trouble if this assert fails.
+    }
+}
+
+bool SDL_TryLockMutex(SDL_Mutex *mutex)
+{
+    bool result = true;
+    if (mutex) {
+        const SceInt32 res = sceKernelTryLockLwMutex(&mutex->lock, 1);
+        if (res == SCE_KERNEL_ERROR_OK) {
+            result = true;
+        } else if (res == SCE_KERNEL_ERROR_WAIT_TIMEOUT) {
+            result = false;
+        } else {
+            SDL_assert(res == SCE_KERNEL_ERROR_OK);  // assume we're in a lot of trouble if this assert fails.
+            result = false;
+        }
+    }
+    return result;
+}
+
+void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS  // clang doesn't know about NULL mutexes
+{
+    if (mutex) {
+        const SceInt32 res = sceKernelUnlockLwMutex(&mutex->lock, 1);
+        SDL_assert(res == SCE_KERNEL_ERROR_OK);  // assume we're in a lot of trouble if this assert fails.
+    }
+}
+
+#endif // SDL_THREAD_PSP